Question

prepare a model of elextrical energy can converted into heat energy (using room heater/ water heater/ electric stove etc.)

Answer 1

For making electric heater, the required materials are resistance wire, knitting needle, a tin can, a piece of clay stem pipe for both ends, wire and a 6 V battery.
First wrap the resistance wire round the needle.Now, can is cut,the resistance wire is inserted and holes are poked in the side of the can with the needle. Now, use the clay stem pipe to insulate both ends where the resistance wire sticks out.
Finally, wires are attached to the end of the resistance wire element and a 6 volt battery is attached it so that it can start operating.